Not only the students but also the teacher ___enjoying the film at 9 pm yesterday.

What does he want to do after hefinishes middle school—He has made up his mind to join the armyrather than______ to college.

The rubbish _____ is produced every day is becoming a serious problem in cities around the world.

The two old men ______ each other since 1970.

It is only with the help of scientific research _____ bring PM1 air pollution under control.